S71911 CD/P4ADT
Sealed Super Precision Angular Contact Ball Bearings
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S71911 CD/P4ADT Bearing Product Overview & Core Advantages
The S71911 CD/P4ADT is a precision duplex tandem angular contact ball bearing designed for high-performance applications requiring exceptional rigidity and accuracy. This matched bearing set features a P4A tolerance class, delivering superior running accuracy for demanding machinery. Its primary advantage lies in its ability to handle combined radial and axial loads efficiently while operating at high speeds. The duplex tandem (DT) arrangement is specifically engineered to support heavy unidirectional axial loads, making it ideal for applications where maximum axial stiffness is critical. Preloaded and sealed with high-performance grease, this bearing offers reliable, maintenance-free operation in precision spindles and other high-speed equipment.
S71911 CD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71911 | Basic bearing designation indicating a 55mm bore, 80mm OD, 26mm width angular contact ball bearing |
| CD | Duplex configuration with tandem arrangement (DT) for maximum axial load capacity in one direction |
| P4A | High precision tolerance class with enhanced running accuracy requirements |
| Sealed | Integrated seals providing contamination protection and retaining lubrication |
S71911 CD/P4ADT Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex tandem arrangement creates an exceptionally rigid bearing system capable of withstanding heavy unidirectional axial loads while maintaining precise shaft positioning. The 15° contact angle provides optimal balance between radial and axial load carrying capacity.
Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, critical for high-speed applications. The phenolic cage contributes to smooth operation at the limiting speed of 34,000 rpm while reducing weight and friction.
Long Service Life: Constructed from chrome steel for both rings and balls, the bearing delivers excellent wear resistance and durability. The sealed design with factory-applied grease provides maintenance-free operation throughout the temperature range of -30°C to 110°C.
Optimized Design: With 23 balls of 7.938mm diameter precisely arranged, the bearing achieves high dynamic load ratings (7020 lbf radial dynamic) while maintaining smooth rotational characteristics essential for precision applications.
S71911 CD/P4ADT Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes requiring exceptional rigidity and accuracy
- Precision Instrumentation: Measuring equipment, optical instruments, and laboratory apparatus demanding minimal vibration and runout
- High-Speed Automation: Industrial robots, CNC machinery, and automated production equipment where reliability and precision are critical
- Medical Equipment: Dental handpieces, surgical tools, and diagnostic imaging systems requiring smooth, precise rotation
- Aerospace Components: Guidance systems, actuators, and auxiliary power units where high reliability and precision are mandatory
